"The problem with the enhanced jet streak is as isohume just pointed out to me on another board is that the GFS cross sections show no deep omega coupling with very little in the way of low level forcing."
It probably isn't far enough NW w/ the precipitation shield even though it's pretty far NW in its own right. The problem with Isohume's line of rationale is that there's really nice Q vector convergence all the way back into eastern Tennessee and the Apps of NC, VA, and even into West Virginia, which argues that may get something out of this as well even though many of the models don't show much quite yet and/or show little in the way of deep omega coupling for the moment.
(Q vectors essentially show the summation of differential vorticity advection and differential temperature advection which both contribute to lift in the quasi-geostrophic framework. Cyclonic vorticity advection and positive differential temperature advection (i.e. increasing warm air advection w/ height) both argue for ascent and vis versa. Sometimes you'll see cancellation of these parameters, you'll have warm air advection but anticyclonic vorticity advection so Q vectors help you flesh out these cancellation problems and wherever they're converging, large-scale ascent is favored and vis versa. Below you'll notice the Q vector convergence (shaded in red) over the SE US where ascent is favored and vis versa over the Mississippi Valley where Q vector divergence argues for descent.)
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